centos man page for read_cache_pages

READ_CACHE_PAGES(9)					    Memory Management in Linux					       READ_CACHE_PAGES(9)

NAME
       read_cache_pages - populate an address space with some pages & start reads against them

SYNOPSIS
       int read_cache_pages(struct address_space * mapping, struct list_head * pages, int (*filler) (void *, struct page *), void * data);

ARGUMENTS
       mapping
	   the address_space

       pages
	   The address of a list_head which contains the target pages. These pages have their ->index populated and are otherwise uninitialised.

       filler
	   callback routine for filling a single page.

       data
	   private data for the callback routine.

DESCRIPTION
       Hides the details of the LRU cache etc from the filesystems.

COPYRIGHT
Kernel Hackers Manual 3.10					     June 2014						       READ_CACHE_PAGES(9)